Mg+2HCl--->MgCl2+H2

Question

Using the balanced equation, how many moles of H2 will you make if you start with .00082 moles of Mg solid? How many grams of H2 is that?

Answer 1

0.00082 mols Mg x (1 mol H2/1 mol Mg) = 0.00082 x 1/1 = mols H2.

grams H2 = mols H2 x molar mass H2.